Rogerio Marques rogeriomarques

Description

This simple script will take a picture of a whiteboard and use parts of the ImageMagick library with sane defaults to clean it up tremendously.

The script is here:

#!/bin/bash
convert "$1" -morphology Convolve DoG:15,100,0 -negate -normalize -blur 0x1 -channel RBG -level 60%,91%,0.1 "$2"

Results

General Background and Overview

Probabilistic Data Structures for Web Analytics and Data Mining : A great overview of the space of probabilistic data structures and how they are used in approximation algorithm implementation.
Models and Issues in Data Stream Systems
Philippe Flajolet’s contribution to streaming algorithms : A presentation by Jérémie Lumbroso that visits some of the hostorical perspectives and how it all began with Flajolet
Approximate Frequency Counts over Data Streams by Gurmeet Singh Manku & Rajeev Motwani : One of the early papers on the subject.
[Methods for Finding Frequent Items in Data Streams](http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.187.9800&rep=rep1&t

New computer setup

a/o 2020-05-29

--

Format the drive

Restart with Cmd-R or Cmd-D
Erase drive / 3x if second-hand
Reinstall MacOS

#Linux Rootkit Security

It is important to use a rootkit checker to ensure that you system is not compromised. These work by looking for code sequences from known rootkits and comparing various files against MD5 checksums when the system is known to be clean (ie after initial installation).

Two such programs are:

Rootkit Hunter (www.rootkit.nl)
chkrootkit (www.chkrootkit.org)

These should be run regularly, preferably from Cron. It also helps to run them when the computer is online so that they can automatically update their database of known rootkits.

#Linux - Running a Node Service (PM2) PM2 is a replacement for Forever which is used to run Node services (see http://devo.ps/blog/2013/06/26/goodbye-node-forever-hello-pm2.html). It has a number of advantages over forever:

Log aggregation
API
Terminal monitoring
Clustering
JSON configuration

Installation

#DNS Basics Domain names are a core feature of the internet. It is simply a mechanism to give a friendly name to remove the need to use ip addresses directly. It also has a number of advantages, such as:

It allows you to have more than one domain name pointing at the same ip address (ie same website).
It allows you to host more than one website on a specific ip address (ie shared hosting, the website shown in the one associated with the domain name)

Record Type

#Linux - Cron Basics

Cron is a linux scheduling service which is used primarly on servers. It works by waking up each minute and checking its configuration files (known as crontabs) to see if there is anything to run. Cron is normally started at boot time.

###Typical uses:

Rotating log files
Summarising log files (ie Logwatch and Webalizer)
Autochecking for Distro updates
Performing Backups

	"""
	This script requires the following Packages

	1: Twitter: https://pypi.python.org/pypi/twitter
	2: PyQuery: https://pypi.python.org/pypi/pyquery
	3: Jinja2: https://pypi.python.org/pypi/Jinja2

	It's fairly primitive but works. It uses a Jinja2 template to create an OPML
	file from the RSS feeds of the websites run by the people you follow on
	Twitter.

	type Post struct {
	// db tag lets you specify the column name if it differs from the struct field
	Id int64 `db:"post_id"`
	Created int64
	Title string `form:"Title" binding:"required"`
	Body string `form:"Body"`
	UserId int64 `form:"UserId"`
	Url string
	}

	.NET
	.NET Core
	Agile
	AI/alias[AI\|Artificial Intelligence]
	Airflow
	Android
	Ansible
	Angular 2/alias[Angular2\|Angular 2]
	AngularJS/js[Angular]
	API